Case Report
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World J Gastroenterol. Jul 14, 2013; 19(26): 4267-4270
Published online Jul 14, 2013. doi: 10.3748/wjg.v19.i26.4267
Unexpected endoscopic full-thickness resection of a duodenal neuroendocrine tumor
Ken Hatogai, Yasuhiro Oono, Kuang-I Fu, Tomoyuki Odagaki, Hiroaki Ikematsu, Takashi Kojima, Tomonori Yano, Kazuhiro Kaneko
Ken Hatogai, Yasuhiro Oono, Tomoyuki Odagaki, Hiroaki Ikematsu, Takashi Kojima, Tomonori Yano, Kazuhiro Kaneko, Division of Digestive Endoscopy, Department of Gastroenterology, National Cancer Center Hospital East, Kashiwa City, Chiba 277-8577, Japan
Kuang-I Fu, Department of Gastroenterology, Juntendou University Nerima Hospital, Tokyo 177-8521, Japan
Author contributions: Hatogai K drafted the manuscript under the direction of Oono Y; Fu KI revised the manuscript; Ikematsu H, Odagaki T and Kojima T contributed the case in endoscopic diagnosis; Yano T and Kaneko K made the final corrections and comments.
Correspondence to: Ken Hatogai, MD, Division of Digestive Endoscopy, Department of Gastroenterology, National Cancer Center Hospital East, 6-5-1, Kashiwanoha, Kashiwa City, Chiba, 277-8577, Japan. kn_hatogai@hotmail.com
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Received: February 1, 2013
Revised: April 3, 2013
Accepted: April 10, 2013
Published online: July 14, 2013
Core Tip

Core tip: We herein report a case of endoscopic full-thickness resection of a duodenal neuroendocrine tumor after unplanned injection into the subserosal layer. Generally, large perforations require urgent salvage surgery and duodenal perforation is more serious than other sites of the gastrointestinal tract because of bile acid and pancreatic juice. In this case, we found the ‘‘mirror target sign’’ immediately, and repaired the defect endoscopically. Prompt recognition of this sign and rapid closing of the defect is important to minimize injury.